单项选择题 进行曲轴弯曲度检测时，应使用百分表测量( )。 A、第一主轴颈 B、第二主轴颈 C、中间主轴颈 D、第五主轴颈

单项选择题 How many awards does the Academy Awards (Oscars) consist of? A、21 B、22 C、23 D、24

单项选择题 Silk was such an important product from China that the trade route from Europe to China became known as ————.A.the Silky RoadB.the Silk RoadC.the Seek RoadD.the Sea Road